Fuse-plug.



C. J. ALPAUGH.

FUSE PLUG. APPLICATION mm JAN. 1a, 1918.

Patented Sept. 3, 1918 H m .RG E O N T R N 0 E .T VA T N A UNITED STATESPATENT OFFICE.

CLIFFORD J.' ALPAUGH, or TRENTON, NEW JERSEY.-

FUSE-PLUG.

vide a simple practical and inexpensive form I of plug which can be easily assembled and tested and in which the fuse will be properly housed and protected to prevent escape of molten metal when the fuse blows.

Briefly the invention comprises a tubular. body member substantlally closed at its outer end but open at its inner end to receive a cap member which closes said open endof the tubular body and carries both the circuit terminals and the fusible element connecting 3 wherein Figure 1 is a longitudinal sectional view of :the fuse j the same. The screw shell which forms one a of the circuit terminals is utilized as a means for securing the two parts of the body together and is formed with an integral extension introverted into the tubular body mem ber and constituting a conductingstrip to which, the inner end of the fuse element'is connected. I Other features of the invention will appear as the specification proceeds.

The accompanying drawing illustrates the invention in a practical and preferred form,

of the, fuse plug.

Fig. 2, is a perspective view and terminal carrying element as it appears ready for attachment to the tubular body age fsecured togetherby-the' screw she'll conmember.

Fig. 3, is a view. of the contact end of. the

plug, parts being broken away and shown I p I p 7 preferably keyed non-rotatably together as by providing a lug"1 7 on the body member taking into a groove 18 in the annular wall .of the cap member. Also 'the'screw shellis in section.

The plug-is made u of two main parts, a mainbody member 5 1n the form of a tubular shellhaving an open inner end and a substantially closed outer end, and a cap member 6 designed to close the.open inner end of the firstmember. These two members are made of suitable insulating material and" constitute, whenassembled, arclosed chamher for the fuse, said chamber usually having ventilating openings for: the escape of gases such as those indicated at 6 provided inthe, otherwise-closed outer end of the "main body,member.-.

-Thegtwo insulating members' of the plug I Specification of Letters Patent;

Applicetionflled'lanuary 18, 1918.

a plain; as indicated at '11 so screw shell being engaged endwise thereover.

SerialN'o. 212,430.

' Patented Sept. 3, 191N811 tact 7, said shell having an end flange 8 over,-

lyin the rim of the cap member 6 so as to con he the same against the end of the tubular body member. The screw shell is preferably secured to the body member by indent ing portions 9 thereof over suitable locking shoulders 10 provided on the outer surface of said tubular member. The outer surface of said member is otherwise preferably left as to permit the The cap member is preferably formed with a protruding annular wall 12 extending, when the parts are assembled, into the tubular body member, said wall forming a cup or pocket receiving the fuse wire 13 and designed to catch the molten" fuse metal.

The fuse wire is conneoted'at one end with the centerconta'ct 14 and'at its opposite end with the screw shell, the connection "of the latter being made through the agency of a A conducting strip 15 formed integralwith the end flange 8 and introverted up into the tubular body member, said conducting strip lyin as indicated in Fig. 1, in between the tubu'ar wall of the bodymember and the inwardly projecting annullarwall 12 ofthe cap member and being beiit' over the rim of the latter as indicated at 16 to form a seat to- .which the end of the fuse wire may be secured as by soldering. This bent inner end,

16 of the conducting strip also serves to hold the screw shell and cap member together when the fuse wire is being soldered in place and when said parts, as a single unit, as

shown in Fig. 2, arebeing inserted into the tubular body member. The rim of the cap member is notched at 21 for the passage :of the introverted conducting strip.

The body member and cap member are preferably keyed non-rot'aitablj to memb'eras making the cap member with a central angular projection 19 proJecting.

through a correspondingly angularly shaped opening 20 in the lower end of the screw shell.

The plug is assembled by simply inserting the cap member in the screwshell, soldering or otherwise securing the inner end of the shell conducting strip and then. applying; 3 this fuse and terminalcarrying unlt to fuse to the-terminal portion 16 of the screw tubular body member, the' annular" portion of the cap member sliding-up into the tubular body and the screw shelhsliding up over.

. in their finally connected form being tested of insulating material closing the OPBIIIIIIIBI der to thereby secure the body member, cap.

-3 0 member. and screw shell together, the screw before being applied to the body member of i the fuse. The test can thus be made while the fuse andall parts of the terminals are fully exposed.

I claim 1. A fuse plug comprising, a tubular member of insulating material closed at its outer end and open at its inner end, a cap piece endof the tubular body member, means for keying said two members together to prevent relative rotation between the same, ascrew shell having an end flange engaging over the cap member,-said body member having a substantially smooth external surface whereby the screw shell may be slipped endwise over the same to hold the cap member thereto, said body member further having an external shoulder and the screw shell having a portion indented over said shoulshell having a conducting strip integral with the end flange thereof introverted into the tubular body member, an end contact on the cap member and a fusible link connected between the conducting strip and end contact. i

2. A fuse plugcomprising, a tubular member of insulating material closed at its outer end and open at its inner end, a cap piece of insulating material closing the open in ner end of the tubular body member, means for keying said two members together to pre ventrelative rotation between'the same, a screw shell having an end flange engaging over the cap. member, said body member having a substantially smooth external surface whereby the screw shell may be slipped endwise over the same to hold the cap member thereto, said body member further having an external shoulder and the screw shell having a portion indented over said shoulder to thereby secure the body member, cap

member and screw shell together, the screw shell having a conducting strip integral with the end flange thereof introverted into the tubular body member, an end contact on the cap member, a fusible link connected between the conducting strip and end contact,,the tubular body member and cap inember v having interengaging elements securin 3. A fuse plug comprismg, a tubular body ing strip of the screw shell and a member of insulating material open at its inner end and substantially closed at its, outer end, said body member having a s ub 'stantially smooth exterior formed with look? ing shoulders, a cap member closing the open inner end of the tubular body member and having a tubular wall extending into the tubular body member, one of said members having a lug and the other having a recess receiving the same, whereby the two mem-' bers are non-rotatably connected together, a screw shell engaged longitudinally over the relatively smooth exterior of the tubular body member, said screw shell having an end flange engaged with the cap member and having portions indented over the locking shoulders, whereby to secure all of said parts together, a conducting strip integrally attached to the end flange of the screw shell and. extending up into the tubular body member-between the wall of said tubular member and the tubular wall of the cap member, the inner end of said conducting strip being bent over the inner end of said tubular wall, an end contact on the cap member and a fusible link connected at one end with said contact and connected at its opposite end with the bent over inner end of the conducting strip.

4. A fuse plug comprising, a screw shell having an end flange and a conducting strip projecting from said end flange up into the interior of said screw shell, a cap member of insulating material seated in said screw shell and resting on the end flange thereof, said member having a portion projecting beyond the end flange of'the screw shell, said projecting portion and. screw shell flange having engaging portions preventing relative rotation of the screw shell and cap member, said cap member having a passage in one edge'portion thereof for the introverted conducting strip of the screw shell and a projecting annular wall, said conductin strip extending along said annular wall and being bent over the inner end thereof, a center contact carried by the cap member, a fusible link secured between said end contact and the bent over inner end of the conducting strip and a tubular body member adapted to receive said cap member and screw shell.

5. A fuseplug comprising, a screw shell having an end flange and a conducting strip projecting from said end flange up into the interior of said screw shell, a cap member of insulating material seated in said screw shell and resting on the end flange thereof, said member having a portion projecting beyond the end flange of the screw shell, said projecting portion and screw shellflange having g, cap memberlaaving a passage in one edge said two members against relative rotatidn.

, tending along said annular wall and being bent overthe inner end thereof, a center contact carried by the cap member, a fusible link secured between said end contact and the bent over inner end of the conducting strip, a tubular body member having a substantiallyclosed outer end and an open inner end adapted to receive the cap member, said body -member having a substantially smooth external surface, whereby the screw shell may be engaged longitudinally thereover and locking. shoulders adaptedto receive indented portions of the screw shell and means for keying the tubular body member and cap -member to ether.

6. In a use plug, a tubular body member having a substantially closed outer end and an open engageable with said tubular body member Comprising, a screw shell having an end Y flange and an introverted conducting strip integral with said end flange,a cap member for closing the open inner end of the tubular body member seated on the end flange of the screw shell and having a tubular wall projecting into the screw shell and into the open inner end of the tubular body member, an end contact carried by the cap member and a inner end and a fuse carrying unit fusible link connected at one end with said end contact and at its other end with the inher end portion of the introverted conduct-r ing strip.

In a fuse plug, a tubular body member having a substantially closed outer end and an open inner end and a fuse carrying unit engageable with said tubular body member comprising, a screw shell having an end flange and an introverted conducting strip integral with said end flange, a cap member for closing the open inner end of the tubular body member seated on the end flange of the screw shelland having a. tubular wall projecting into the screw shell and into the open inner end of the tubular body member, an end contact carried by the cap member; a

fusible link connected at one end with'said end. contact and at its other end with the inner end portion of the introverted conducting strip, engaging parts on the tubular member an mm at this as m be obtained to; m a. each, by addressing m emu-1m: o! nun,

- Washington, D. GI." 

